Mathematics, 20.02.2020 22:19 bbenaventbbbb9653
Of 200 youthful gamers (under 18) who tried the new Z-Box-Plus game, 160 rated it "excellent," compared with only 144 of 200 adult gamers (18 or over). The test statistic to test if the two proportions differed significantly would be a. 1645 b. 1.960 c. 1.873 d. 1448
Answers: 3
![z=\frac{\hat p_{1}-\hat p_{2}}{\sqrt{P(1-P)[\frac{1}{n_{1}}+\frac{1}{n_{2}} ]} } =\frac{0.80-0.72}{\sqrt{0.76(1-0.76)[\frac{1}{200}+\frac{1}{200} ]} }=1.873](/tpl/images/0518/0077/b7dd9.png)
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Of 200 youthful gamers (under 18) who tried the new Z-Box-Plus game, 160 rated it "excellent," compa...
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